Inductive charging for a self-balancing robot - Design and development of prototype

In this master’s thesis project an inductive power transfer (IPT) system is designed
and developed. This IPT system should in the future be implemented in Aros Electronics
self-balancing robot Glenn. The system can transfer 153 W over a 3 cm air
gap with an efficiency of 84.5 %. Furthermore, the IPT system is able to transfer
100 W with a misalignment between the power pads of 4 cm as well as an increased
air gap to 4 cm. The IPT system has been designed by iterations between COMSOL
simulations and circuit simulations in LT spice.
The power supply in the IPT system produces a 83 kHz square-wave voltage. The
system uses series-series capacitive compensation to achieve resonance on the transmitting
and receiving circuits. With the series-series compensation the systems
functions as a voltage source and the compensations is independent of load and the
mutual inductance, making it a suitable choice for charging of batteries.
The transmitting and receiving coils are made of litz wire to decrease skin effect and
proximity effect. The coils are placed on ferrite plates to increase the magnetic field
and mutual inductance between the coils, resulting in two power pads.

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BibTeX @mastersthesis{Carlsson2016,author={Carlsson, Fredrik and Bååth, Ola},title={Inductive charging for a self-balancing robot - Design and development of prototype},abstract={In this master’s thesis project an inductive power transfer (IPT) system is designed
and developed. This IPT system should in the future be implemented in Aros Electronics
self-balancing robot Glenn. The system can transfer 153 W over a 3 cm air
gap with an efficiency of 84.5 %. Furthermore, the IPT system is able to transfer
100 W with a misalignment between the power pads of 4 cm as well as an increased
air gap to 4 cm. The IPT system has been designed by iterations between COMSOL
simulations and circuit simulations in LT spice.
The power supply in the IPT system produces a 83 kHz square-wave voltage. The
system uses series-series capacitive compensation to achieve resonance on the transmitting
and receiving circuits. With the series-series compensation the systems
functions as a voltage source and the compensations is independent of load and the
mutual inductance, making it a suitable choice for charging of batteries.
The transmitting and receiving coils are made of litz wire to decrease skin effect and
proximity effect. The coils are placed on ferrite plates to increase the magnetic field
and mutual inductance between the coils, resulting in two power pads.},publisher={Institutionen för energi och miljö, Elteknik, Chalmers tekniska högskola},place={Göteborg},year={2016},keywords={Inductive power transfer (IPT), power pad, litz wire, misalignment, air gap},note={42},}

RefWorks RT GenericSR ElectronicID 239184A1 Carlsson, FredrikA1 Bååth, OlaT1 Inductive charging for a self-balancing robot - Design and development of prototypeYR 2016AB In this master’s thesis project an inductive power transfer (IPT) system is designed
and developed. This IPT system should in the future be implemented in Aros Electronics
self-balancing robot Glenn. The system can transfer 153 W over a 3 cm air
gap with an efficiency of 84.5 %. Furthermore, the IPT system is able to transfer
100 W with a misalignment between the power pads of 4 cm as well as an increased
air gap to 4 cm. The IPT system has been designed by iterations between COMSOL
simulations and circuit simulations in LT spice.
The power supply in the IPT system produces a 83 kHz square-wave voltage. The
system uses series-series capacitive compensation to achieve resonance on the transmitting
and receiving circuits. With the series-series compensation the systems
functions as a voltage source and the compensations is independent of load and the
mutual inductance, making it a suitable choice for charging of batteries.
The transmitting and receiving coils are made of litz wire to decrease skin effect and
proximity effect. The coils are placed on ferrite plates to increase the magnetic field
and mutual inductance between the coils, resulting in two power pads.PB Institutionen för energi och miljö, Elteknik, Chalmers tekniska högskola,PB Institutionen för energi och miljö, Elteknik, Chalmers tekniska högskola,LA engLK http://publications.lib.chalmers.se/records/fulltext/239184/239184.pdfOL 30